Temperature & the Laws of Thermodynamics Lecture Notes

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Presentation transcript:

Temperature & the Laws of Thermodynamics Lecture Notes

Zeroth Law of Thermodynamics If objects A and B are separately in thermal equilibrium with a third object C, then A and B are in thermal equilibrium with each other.

Temperature The property that determines whether an object is in thermal equilibrium with another. Temperature is a measurement of the average kinetic energy of the molecules in an object or system. It is a means of determining the internal energy within the system.

Temperature Cont’d Some physical properties that change with temperature: Volume of a liquid The dimensions of a solid The pressure of a gas at constant volume The volume of a gas at constant pressure The electric resistance of a conductor The color of an object pg. 534 7th Edition

The Celsius, Fahrenheit, and Kelvin Temperature Conversions From To Fahrenheit To Celsius To Kelvin Fahrenheit (F) F (F - 32) * 5/9 (F - 32) * 5/9 + 273.15 Celsius (C or o) (C * 9/5) + 32 C C + 273.15 Kelvin (K) (K - 273.15) * 9/5 + 32 K - 273.15 K *When encountering an equation that calls for T, convert all temperatures to K. When the equation contains ∆𝑇, using Celsius temperatures will give you the correct answer.

First Law of Thermodynamics Energy can be changed from one form to another, but it cannot be created or destroyed. The total amount of energy and matter in the Universe remains constant, merely changing from one form to another.

Second Law of Thermodynamics The second law of thermodynamics states that for any process occurring in a closed system, the entropy increases for an irreversible system and remains constant for a reversible system, but never decreases.

Summary of Thermodynamic Laws